<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #d1{
            width: 1000px;
            height: 100px;
            background-color: red;
            position: fixed;/*固定定位*/
        }
        #d2{
            width: 50px;
            height: 200px;
            background-color: blue;
            position: fixed;
          /*通过left/right/top/bottom相当于窗口做偏移*/
            right: 20px;
            bottom: 50px;
        }
    </style>
</head>
<body>
    <div id="d1"></div>
    <div id="d2"></div>
    <img src="../b.jpg" alt="">
    <img src="../b.jpg" alt="">
    <img src="../b.jpg" alt="">
    <img src="../b.jpg" alt="">
    <img src="../b.jpg" alt="">
    <img src="../b.jpg" alt="">
    <img src="../b.jpg" alt="">
</body>
</html>